CN111488065A - Cholesteric liquid crystal handwriting board and preparation method thereof - Google Patents
Cholesteric liquid crystal handwriting board and preparation method thereof Download PDFInfo
- Publication number
- CN111488065A CN111488065A CN202010452504.2A CN202010452504A CN111488065A CN 111488065 A CN111488065 A CN 111488065A CN 202010452504 A CN202010452504 A CN 202010452504A CN 111488065 A CN111488065 A CN 111488065A
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- layer
- polymer
- substrate
- cholesteric liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03547—Touch pads, in which fingers can move on a surface
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
Abstract
The invention provides a cholesteric liquid crystal handwriting board and a preparation method thereof, belonging to the technical field of liquid crystal materials. The invention provides a cholesteric liquid crystal handwriting board which comprises a first substrate, a first ITO (indium tin oxide) conducting layer, a first polymer layer, a liquid crystal layer, a second polymer layer, a second ITO conducting layer and a second substrate which are sequentially stacked. According to the invention, the polymer layer is attached to the conducting layer, and the thickness of the liquid crystal layer can be finely adjusted due to the polymer layer, so that the thickness of the liquid crystal layer can be reduced as much as possible while the handwriting brightness is not influenced, the driving voltage is reduced, and the service life of the handwriting board is prolonged. Meanwhile, the existence of the polymer layer improves the adhesion between the substrate and the liquid crystal layer and improves the integrity of the handwriting board.
Description
Technical Field
The invention relates to the technical field of liquid crystal materials, in particular to a cholesteric liquid crystal handwriting board and a preparation method thereof.
Background
At present, a cholesteric liquid crystal writing pad mainly comprises a substrate, an ITO (indium tin oxide) conductive layer and a liquid crystal layer. The ITO layer is thin and used for being connected with a power supply, the first ITO layer and the second ITO layer are connected with the power supply to form a capacitor, an electric field can be formed in the liquid crystal layer, and fig. 1 is a schematic structural diagram of a cholestan-phase liquid crystal handwriting board in the prior art and comprises a first substrate, a first ITO conducting layer, a liquid crystal layer, a second ITO conducting layer and a second substrate.
The liquid crystal layer material liquid layer is a polymer stable cholesteric liquid crystal layer, polymerized monomers, an initiator, a spacer and a chiral agent are dissolved in liquid crystal, are uniformly mixed and dripped between two layers of substrates, then the substrates are extruded by a roller, and the two layers of substrates are adhered together by utilizing the affinity of liquid crystal layer material liquid and the substrates, and fig. 2 is a schematic diagram of extruding liquid crystal layer material liquid. Therefore, the thickness of the liquid crystal layer depends on the spacing between the two substrates, i.e., the diameter of the spacer.
The polymer stabilized cholesteric liquid crystal can be formed by ultraviolet polymerization, and light can penetrate through the liquid crystal layer and be absorbed by the black second substrate in a normal state, so that black is displayed. When the liquid crystal layer is stressed, the cholesteric liquid crystal can be changed into a uniform P state, so that light with different wavelengths is reflected according to different screw pitches (adjusted by the content of the added chiral agent), the rest light directly penetrates through the liquid crystal layer and is absorbed by the black second substrate, and the place stressed by the stress can reflect light with a certain wave band (the screw pitches are different, the wave bands of reflected light are different, and the colors of the reflected light are different).
At present, the method for controlling the thickness of the liquid crystal layer can only be adjusted by using spacers, but the diameter of the spacers is generally about several micrometers, the spacers are extremely small particles, only one kind of spacers can be used for changing the thickness of the liquid crystal layer, the types of the spacers can be selected, and fine adjustment is difficult. In addition, the adhesion of the polymer in the liquid crystal layer to the glass substrate is poor, and the phase separation during the polymerization naturally occurs without achieving the best effect, thereby making the brightness undesirable.
Disclosure of Invention
In view of the above, the present invention is directed to a cholesteric liquid crystal handwriting board and a method for manufacturing the same. The cholesteric liquid crystal handwriting board provided by the invention can realize fine adjustment of the thickness of the liquid crystal layer and has ideal brightness.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a cholesteric liquid crystal handwriting board which comprises a first substrate, a first ITO (indium tin oxide) conducting layer, a first polymer layer, a liquid crystal layer, a second polymer layer, a second ITO conducting layer and a second substrate which are sequentially stacked, wherein the first polymer layer and the second polymer layer are made of flexible polymers.
Preferably, the flexible polymer is a polyamide, polyimide, ester or olefin polymer with ester side groups.
Preferably, the first polymer layer and the second polymer layer are ion etched; the parameters of the ion etching comprise: the gas used is oxygen and helium, the flow rate of the helium is 80-100 sccm, and the flow rate of the oxygen is 2-2.5 sccm; the frequency is 20-25 kHz, the voltage is 15-20 kV, and the time is 60-70 s.
Preferably, the first polymer layer and the second polymer layer independently have a thickness of 100nm to 1 μm.
Preferably, the liquid crystal layer is made of a liquid crystal layer feed liquid, and the liquid crystal layer feed liquid comprises the following components in parts by weight: 8-10 parts of a polymerization monomer, 0.5-1.5 parts of a photoinitiator, 2-4 parts of a chiral agent, 6-8 parts of a spacer and 100 parts of a liquid crystal.
Preferably, the polymerized monomer comprises RM257, the photoinitiator is BME or Darocur1173, the chiral agent is R6N, the spacer is polystyrene nanoparticles, and the liquid crystal is liquid crystal E7.
Preferably, the average particle size of the spacers is 3 to 10 μm.
The invention also provides a preparation method of the cholesteric liquid crystal handwriting board, which comprises the following steps:
sequentially attaching a first ITO conductive layer and a first polymer layer on the surface of the first substrate, and sequentially attaching a second ITO conductive layer and a second polymer layer on the surface of the second substrate to obtain two clamping plates;
and dripping the liquid crystal layer material at one end between the two clamping plates, extruding the liquid crystal layer material from one end of the clamping plate to the other end by using a roller, and polymerizing ultraviolet light after repeated extrusion to obtain the cholesteric liquid crystal handwriting board.
Preferably, the method further comprises ion etching the polymer layer of the substrate to which the polymer layer and the conductive layer are attached.
Preferably, the ultraviolet light intensity of the ultraviolet polymerization is 3-10 mW/cm2The time is 4-8 min.
Has the advantages that:
the invention provides a cholesteric liquid crystal handwriting board, which is characterized in that a polymer layer is added on a first ITO conducting layer and a second ITO conducting layer, the polymer is a flexible substance and can be squeezed by a spacer when being squeezed by a roller, so that the gap between the first ITO conducting layer and the second ITO conducting layer is not changed, but the thickness of a liquid crystal layer is reduced due to the fact that two layers of polymers are added at the position without the spacer, and the purpose of fine adjustment of the thickness of the liquid crystal layer is achieved; in particular, if said the diameter d of the spaceraThe thickness of the polymer layer is l, and the thickness of the liquid crystal layer is L1D, thickness L of liquid crystal layer filled with polymer layer2＝da2 l. The first ITO conductive layer and the second ITO conductive layer can form a capacitor when electrified, and the interval d of the capacitor can be reduced by selecting a polymer layer with good conductivitybThereby reducing the applied voltage without reducing the electric field strength E: applied voltage U ═ EdbAnd the service life of the handwriting board is prolonged.
The ITO conducting layer is in contact with the liquid crystal layer, the ITO conducting layer belongs to an inorganic structure, the adhesion force between a polymer chain and the ITO conducting layer is not good enough when the liquid crystal layer is polymerized, the interface affinity is improved by attaching a polymer layer on the ITO conducting layer, and meanwhile, a monomer in the liquid crystal layer is polymerized by a free radical, and is easily connected to the polymer layer directly in a covalent bond mode through chain transfer, so that the overall adhesion force is increased.
Furthermore, because the ITO conductive layer has poor affinity to monomers in the liquid crystal layer, phase separation occurs naturally in the polymerization process, and the phase separation effect is not ideal, so that the brightness of the handwriting board is low. The polymer layer attached to the ITO conductive layer is subjected to surface modification through ion etching, the affinity between the polymer layer and the monomer in the liquid crystal layer is increased, the monomer in the liquid crystal layer is easier to form phase separation in the polymerization process, the phase separation degree is improved, and the brightness of the cholesteric liquid crystal handwriting board is improved.
Drawings
FIG. 1 is a schematic structural diagram of a cholesteric liquid crystal handwriting pad in the prior art;
FIG. 2 is a schematic view of a liquid crystal layer feed solution being squeezed;
fig. 3 is a schematic structural diagram of a cholesteric liquid crystal handwriting board provided by the invention.
Detailed Description
The invention provides a cholesteric liquid crystal handwriting board which comprises a first substrate, a first ITO (indium tin oxide) conducting layer, a first polymer layer, a liquid crystal layer, a second polymer layer, a second ITO conducting layer and a second substrate which are sequentially stacked, wherein the first polymer layer and the second polymer layer are made of flexible polymers.
The cholesteric liquid crystal handwriting board provided by the invention comprises a first substrate and a second substrate, wherein the thicknesses of the first substrate and the second substrate are preferably 10-200 mu m independently; the first substrate and the second substrate are preferably made of polyethylene terephthalate (PET) or poly 3, 4-ethylenedioxythiophene (PEDOT).
The cholesteric liquid crystal handwriting board provided by the invention comprises a first ITO conducting layer and a second ITO conducting layer; the thicknesses of the first ITO conductive layer and the second ITO conductive layer are preferably 50-300 nm independently.
The invention preferably directly purchases the substrate attached with the ITO conductive layer, namely the substrate-ITO conductive composite structure; the commercially available substrate-ITO conductive composite structure is preferably pre-treated prior to use, the pre-treatment preferably comprising the steps of: tearing off the protective film on the commercial substrate-ITO conductive composite structure, immediately soaking the protective film in an ethanol water 1:1 solution, performing ultrasonic treatment for 30min, then drying the protective film by using nitrogen, and drying the protective film on a hot bench at 100 ℃ for 10 min; the pre-treated commercial substrate-ITO conductive composite structure is preferably used as soon as possible.
The cholesteric liquid crystal handwriting board provided by the invention comprises a first polymer layer and a second polymer layer, wherein the first polymer layer and the second polymer layer are made of flexible polymers; the flexible polymer is preferably polyamide, polyimide, ester or olefin polymer with ester side groups; the polyamide is preferably poly (p-phenylene terephthalamide); the ester is preferably polyethylene glycol maleate; the olefin polymer with the ester side group is preferably polymerized from RM257 monomers. In the present invention, the thickness of the first polymer layer and the second polymer layer is independently preferably 100nm to 1 μm.
In the present invention, the first polymer layer and the second polymer layer are preferably attached on the ITO conductive layer in a pre-existing commercially available substrate-ITO conductive composite structure by the following first method or second method.
In the present invention, the first method preferably includes the steps of:
and spin-coating a saturated aqueous solution of corresponding oligomer of the polymer on the first ITO conductive layer and the second ITO conductive layer.
In the present invention, the spin coating preferably includes the steps of:
dropping a saturated water solution of an oligomer corresponding to a polymer on a corresponding ITO conductive layer, and performing spin coating and heating to form a polymer layer on the corresponding ITO conductive layer, wherein the heating temperature is preferably 220 ℃, and the time is preferably 8-15 min, and further preferably 10 min.
In the present invention, the second method preferably comprises the steps of:
and dissolving the oligomer corresponding to the polymer in liquid crystal layer feed liquid, dropwise adding the obtained mixture to one end between two pretreated commercial ITO conductive composite structures, extruding the mixture from one end of the composite structure to the other end by using a roller, and polymerizing the mixture by ultraviolet light after repeated extrusion to obtain the cholesteric liquid crystal handwriting board with the polymer layer attached to the ITO conductive layer.
In the present invention, the wavelength of the ultraviolet light is preferably 365 nm.
In the present invention, the ultraviolet light polymerizationPreferably comprises a first ultraviolet polymerization and a second ultraviolet polymerization which are sequentially carried out; the ultraviolet light intensity of the first ultraviolet polymerization is preferably 2mW/cm2The time is preferably 20 min.
In the present invention, the ultraviolet light intensity of the second ultraviolet polymerization is preferably 4.7mW/cm2The time is preferably 5 min.
In the invention, during the first ultraviolet polymerization, the corresponding oligomer of the polymer can be separated out from the liquid crystal layer material liquid after being crosslinked, a layer of polymer is formed on the ITO conducting layer, and then the ultraviolet light intensity is enhanced during the second ultraviolet polymerization, so that the residual polymerized monomer is crosslinked into a network in the liquid crystal phase.
In the invention, when the polymer layer is attached to the ITO conductive layer by adopting the second method, the type of the corresponding oligomer of the polymer is preferably adjusted to be consistent with the type of the polymerization monomer in the liquid crystal layer material liquid; the amount of the polymerized monomer is preferably 5% more than the amount of the polymer monomer that is conventionally added.
In the present invention, it is preferable that the method further includes performing ion etching on the first polymer layer and the second polymer layer, and parameters of the ion etching include: the gas used is preferably oxygen gas and helium gas, the flow rate of the helium gas is preferably 80-100 sccm, and further preferably 100 sccm; the flow rate of the oxygen is preferably 2-2.5 sccm, and further preferably 2.5 sccm; the frequency is preferably 20-25 kHz, and more preferably 20 kHz; the voltage is preferably 15-20 kV, and more preferably 16 kV; the time is preferably 60 to 70 seconds, and more preferably 60 seconds.
The cholesteric liquid crystal handwriting board provided by the invention comprises a liquid crystal layer, wherein the liquid crystal layer is formed by liquid crystal layer feed liquid, and the liquid crystal layer feed liquid preferably comprises the following components in parts by weight: 8-10 parts of a polymerization monomer, 0.5-1.5 parts of a photoinitiator, 2-4 parts of a chiral agent, 6-8 parts of a spacer and 100 parts of a liquid crystal.
In the invention, the polymerization monomer is preferably RM257, the photoinitiator is preferably BME or Darocur1173, the chiral agent is preferably R6N, the spacer is preferably polystyrene nanoparticles (PS), and the particle size of the spacer is preferably 3-10 μm, and is further preferably 5 μm; the liquid crystal is preferably liquid crystal E7.
In the present invention, the method for preparing the liquid crystal layer material liquid preferably comprises the following steps:
and mixing the polymerization monomer, the photoinitiator, the chiral agent, the spacer and the liquid crystal, heating to a temperature above a clearing point, and stirring for 2 hours in a dark place to obtain the liquid crystal layer material liquid.
Fig. 3 is a schematic structural diagram of a cholesteric liquid crystal handwriting board provided by the invention.
The invention also provides a preparation method of the cholesteric liquid crystal handwriting board, which comprises the following steps:
sequentially attaching a first ITO conductive layer and a first polymer layer on the first substrate, and sequentially attaching a second ITO conductive layer and a second polymer layer on the second substrate to obtain two clamping plates;
and dripping the liquid crystal layer material at one end between the two clamping plates, extruding the liquid crystal layer material from one end of the clamping plate to the other end by using a roller, and polymerizing ultraviolet light after repeated extrusion to obtain the cholesteric liquid crystal handwriting board.
According to the invention, a first ITO conductive layer and a first polymer layer are sequentially attached to the first substrate, and a second ITO conductive layer and a second polymer layer are sequentially attached to the second substrate to obtain two clamping plates.
In the present invention, the method of attaching the first ITO conductive layer on the first substrate is preferably a vacuum evaporation method. In the present invention, a substrate to which an ITO conductive layer is attached may be preferably used, and the substrate to which the ITO conductive layer is attached is preferably commercially available. In the present invention, the method for attaching the first polymer layer on the first ITO conductive layer preferably includes a first method or a second method, and the steps and parameters of the first method or the second method are preferably consistent with those of the above technical solution, and are not described herein again. In the present invention, the parameters for attaching the second ITO conductive layer on the second substrate and for attaching the second polymer layer on the second ITO conductive layer are preferably the same as those in the above technical solution, and are not described herein again.
In the present invention, when the first polymer layer and the second polymer layer need to be modified by ion etching, it is preferable that the method further includes ion etching the polymer layer of the substrate attached with the polymer layer and the ITO conductive layer, and the method and parameters of the ion etching are preferably consistent with those of the above-mentioned scheme, and are not described herein again.
After two clamping plates are obtained, the liquid crystal layer material is dripped at one end between the two clamping plates, the liquid crystal layer material is extruded from one end of the clamping plate to the other end by a roller, and ultraviolet light polymerization is carried out after repeated extrusion to obtain the cholesteric liquid crystal handwriting board.
In the present invention, the dropping amount of the liquid crystal layer material liquid may be set according to actual conditions, as long as there is a sufficient amount of the liquid crystal layer material liquid at the squeezing position of the two rollers, and specifically, when the area of the handwriting pad is 10cm by 20cm, the dropping amount of the liquid crystal layer material liquid is preferably 10m L.
In the invention, the wavelength of the ultraviolet light used for ultraviolet light polymerization is preferably 254nm or 365nm, and the intensity of the ultraviolet light is preferably 3-10 mW/cm2The time of the ultraviolet polymerization is preferably 4-8 min.
The invention drops the liquid crystal layer material at one end between the two clamping plates, which is also called as crystal filling; because the liquid crystal layer material liquid contains the spacers, the liquid crystal layer material liquid is uniformly distributed between the two clamping plates through the extrusion of the roller, the repeated extrusion is carried out to remove the air in the liquid crystal layer material liquid, the two clamping plates are firstly and simply adsorbed together by utilizing the affinity and the vacuum effect of the liquid crystal layer material liquid and the polymer layer, and then the polymer network formed through the ultraviolet polymerization is further adhered together.
The cholesteric liquid crystal writing pad and the method for manufacturing the same according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
A method for preparing a cholesteric liquid crystal handwriting board comprises the following steps:
attaching a first ITO (indium tin oxide) conductive layer (the thickness is 100nm) on a first substrate (made of PET) with the thickness of 50 mu m, then dripping a polyamic acid aqueous solution on the first ITO conductive layer, carrying out spin coating (the rotating speed is 3500r/min, the time is 30s), heating at 220 ℃ for 10min, attaching a first polymer layer (polyimide) with the thickness of 1 mu m on the first ITO conductive layer to obtain a clamping plate, and obtaining the other clamping plate according to the same method;
mixing 5 parts by weight of RM257 monomer, 1.2 parts by weight of photoinitiator BME, 0.8 part by weight of chiral agent R6N, 2 parts by weight of PS (particle size of 5 mu m) and 100 parts by weight of liquid crystal E7, heating to a temperature above a clearing point, stirring for 2 hours in a dark place, dripping the obtained liquid crystal layer material at one end between two clamping plates, extruding the liquid crystal layer material from one end of the clamping plate to the other end of the clamping plate by using a roller, and repeatedly extruding for 3 times to obtain ultraviolet light (intensity of 4.7 mW/cm/mW)2) Polymerizing for 5min to obtain the cholesteric liquid crystal handwriting board.
Example 2
A method for preparing a cholesteric liquid crystal handwriting board comprises the following steps:
a first ITO conductive layer (100 nm thick) was attached to a first substrate (PET material) 50 μm thick.
Mixing 10 weight parts of RM257 monomer, 1.2 weight parts of photoinitiator BME, 0.8 weight part of chiral agent R6N, 2 weight parts of PS (particle size is 5 mu m) and 100 weight parts of liquid crystal E7, heating to a temperature above a clearing point, stirring for 2 hours in a dark place, dripping the obtained liquid crystal layer material at one end between two clamping plates, extruding from one end to the other end of the clamping plates by using a roller, repeatedly extruding for 3 times, heating to 100 ℃, and then carrying out ultraviolet light (intensity is 2 mW/cm)2) Polymerizing for 20min to obtain polymer layer (olefin polymer with ester group as side group), stopping irradiation, naturally cooling to room temperature, and applying ultraviolet light (intensity of 4.7 mW/cm)2) Polymerizing for 5min to obtain the cholesteric liquid crystal handwriting board.
Example 3
A method for preparing a cholesteric liquid crystal handwriting board comprises the following steps:
attaching a first ITO conductive layer (with a thickness of 100nm) on a first substrate (PET) with a thickness of 50 μm, dripping aqueous solution of polyamic acid on the first ITO conductive layer, spin-coating (rotation speed 3500r/min, time 30s), heating at 220 deg.C for 10min, attaching a first polymer layer (polyimide) with a thickness of 1 μm on the first ITO conductive layer to obtain a splint, and attaching the splint to the splintPlacing the plate in a plasma etching device for O2Etching, He, O2Etching for 60s at flow rates of 100sccm and 2.5sccm and at a voltage of 20kHz and a peak value of 16kV to obtain an ion etching splint, and obtaining another ion etching splint by the same method;
mixing 5 parts by weight of RM257 monomer, 1.2 parts by weight of photoinitiator BME, 0.8 part by weight of chiral agent R6N, 2 parts by weight of PS (particle size of 5 mu m) and 100 parts by weight of liquid crystal E7, heating to a temperature above a clearing point, stirring for 2 hours in a dark place, dripping the obtained liquid crystal layer material at one end between two clamping plates, extruding the liquid crystal layer material from one end of the clamping plate to the other end of the clamping plate by using a roller, and repeatedly extruding for 3 times to obtain ultraviolet light (intensity of 4.7 mW/cm/mW)2) Polymerizing for 5min to obtain the cholesteric liquid crystal handwriting board.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A cholesteric liquid crystal handwriting board is characterized by comprising a first substrate, a first ITO (indium tin oxide) conducting layer, a first polymer layer, a liquid crystal layer, a second polymer layer, a second ITO conducting layer and a second substrate which are sequentially stacked, wherein the first polymer layer and the second polymer layer are made of flexible polymers.
2. A cholesteric liquid crystal writing pad according to claim 1, wherein the flexible polymer is a polyamide, polyimide, ester or olefin polymer with ester side groups.
3. A cholesteric liquid crystal writing pad according to claim 1 or 2, wherein the first and second polymer layers are ion etched; the parameters of the ion etching comprise: the gas used is oxygen and helium, the flow rate of the helium is 80-100 sccm, and the flow rate of the oxygen is 2-2.5 sccm; the frequency is 20-25 kHz, the voltage is 15-20 kV, and the time is 60-70 s.
4. A cholesteric liquid crystal writing pad according to claim 1 or 2, wherein the first and second polymer layers independently have a thickness of 100nm to 1 μm.
5. A cholesteric liquid crystal handwriting pad according to claim 1 or 2, characterized in that said liquid crystal layer is made of liquid crystal layer feed liquid, said liquid crystal layer feed liquid comprising the following components in parts by weight: 8-10 parts of a polymerization monomer, 0.5-1.5 parts of a photoinitiator, 2-4 parts of a chiral agent, 6-8 parts of a spacer and 100 parts of a liquid crystal.
6. A cholesteric liquid crystal writing pad according to claim 5, wherein the polymerized monomer is RM257, the photoinitiator is BME or Darocur1173, the chiral agent is R6N, the spacer is polystyrene nanoparticles, and the liquid crystal is liquid crystal E7.
7. A cholesteric liquid crystal writing pad according to claim 5 or 6, wherein the spacer has an average particle diameter of 3 to 10 μm.
8. A method of manufacturing a cholesteric liquid crystal writing pad according to claim 1 or 2, comprising the steps of:
sequentially attaching a first ITO conductive layer and a first polymer layer on the surface of the first substrate, and sequentially attaching a second ITO conductive layer and a second polymer layer on the surface of the second substrate to obtain two clamping plates;
and dripping the liquid crystal layer material at one end between the two clamping plates, extruding the liquid crystal layer material from one end of the clamping plate to the other end by using a roller, and polymerizing ultraviolet light after repeated extrusion to obtain the cholesteric liquid crystal handwriting board.
9. The method of claim 8, further comprising ion etching the polymer layer of the substrate to which the polymer layer and the conductive layer are attached.
10. The production method according to claim 8 or 9, wherein the ultraviolet light intensity of the ultraviolet light polymerization is 3 to 10mW/cm2The time is 4-8 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010452504.2A CN111488065A (en) | 2020-05-26 | 2020-05-26 | Cholesteric liquid crystal handwriting board and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010452504.2A CN111488065A (en) | 2020-05-26 | 2020-05-26 | Cholesteric liquid crystal handwriting board and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111488065A true CN111488065A (en) | 2020-08-04 |
Family
ID=71795743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010452504.2A Pending CN111488065A (en) | 2020-05-26 | 2020-05-26 | Cholesteric liquid crystal handwriting board and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111488065A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113050337A (en) * | 2021-04-01 | 2021-06-29 | 深圳市宝立创科技有限公司 | Liquid crystal handwriting board and preparation method thereof |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112686A (en) * | 1993-12-06 | 1995-11-29 | 卡西欧计算机公司 | Liquid crystal display device and process for producing same |
| CN1392439A (en) * | 1995-01-11 | 2003-01-22 | 株式会社半导体能源研究所 | Method and device for producing liquid crystal element |
| CN1422390A (en) * | 2000-12-14 | 2003-06-04 | 皇家菲利浦电子有限公司 | Liquid crystal display laminate and method of manufacturing such |
| JP2007262325A (en) * | 2006-03-29 | 2007-10-11 | Mitsui Chemicals Inc | Polymer blend comprising olefinic block polymer |
| CN101299102A (en) * | 2008-06-18 | 2008-11-05 | 汕头超声显示器（二厂）有限公司 | Capacitance type touch control panel and manufacturing method thereof |
| CN201607591U (en) * | 2010-01-25 | 2010-10-13 | 汕头超声显示器（二厂）有限公司 | Embedded touch-sensing-type display device |
| CN102615894A (en) * | 2012-03-15 | 2012-08-01 | 天津大学 | Flexible liquid crystal thin film and preparation method thereof |
| CN105336873A (en) * | 2015-11-05 | 2016-02-17 | 南京济民信息技术有限公司 | Substrate for flexible photoelectronic device, and preparation method thereof |
| CN208922028U (en) * | 2018-07-19 | 2019-05-31 | 吴飞 | Using organic conductive material as the liquid crystal handwriting pad of conductive layer |
| TW201920545A (en) * | 2017-08-23 | 2019-06-01 | 日商迪睿合股份有限公司 | Tape with binder layer and spacers dispersed the layer |
| CN110308595A (en) * | 2019-04-18 | 2019-10-08 | 好易写（深圳）科技有限公司 | A kind of preparation process and liquid crystal writing film of liquid crystal writing film |
-
2020
- 2020-05-26 CN CN202010452504.2A patent/CN111488065A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112686A (en) * | 1993-12-06 | 1995-11-29 | 卡西欧计算机公司 | Liquid crystal display device and process for producing same |
| CN1392439A (en) * | 1995-01-11 | 2003-01-22 | 株式会社半导体能源研究所 | Method and device for producing liquid crystal element |
| CN1422390A (en) * | 2000-12-14 | 2003-06-04 | 皇家菲利浦电子有限公司 | Liquid crystal display laminate and method of manufacturing such |
| JP2007262325A (en) * | 2006-03-29 | 2007-10-11 | Mitsui Chemicals Inc | Polymer blend comprising olefinic block polymer |
| CN101299102A (en) * | 2008-06-18 | 2008-11-05 | 汕头超声显示器（二厂）有限公司 | Capacitance type touch control panel and manufacturing method thereof |
| CN201607591U (en) * | 2010-01-25 | 2010-10-13 | 汕头超声显示器（二厂）有限公司 | Embedded touch-sensing-type display device |
| CN102615894A (en) * | 2012-03-15 | 2012-08-01 | 天津大学 | Flexible liquid crystal thin film and preparation method thereof |
| CN105336873A (en) * | 2015-11-05 | 2016-02-17 | 南京济民信息技术有限公司 | Substrate for flexible photoelectronic device, and preparation method thereof |
| TW201920545A (en) * | 2017-08-23 | 2019-06-01 | 日商迪睿合股份有限公司 | Tape with binder layer and spacers dispersed the layer |
| CN208922028U (en) * | 2018-07-19 | 2019-05-31 | 吴飞 | Using organic conductive material as the liquid crystal handwriting pad of conductive layer |
| CN110308595A (en) * | 2019-04-18 | 2019-10-08 | 好易写（深圳）科技有限公司 | A kind of preparation process and liquid crystal writing film of liquid crystal writing film |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113050337A (en) * | 2021-04-01 | 2021-06-29 | 深圳市宝立创科技有限公司 | Liquid crystal handwriting board and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102522145B (en) | Nanometer silver transparent electrode material and preparation method thereof | |
| US9454030B2 (en) | Polymer dispersed liquid crystal film and method for manufacturing the same | |
| CN107300818A (en) | It is a kind of that there is liquid crystal laminated film of writing display function and preparation method thereof | |
| CN111584130B (en) | Thermal-repair flexible transparent conductive film and preparation method thereof | |
| JP2001004986A (en) | Liquid crystal optical device and its production | |
| TW200422372A (en) | Adhesive composition, adhesive composition for circuit connection, connected circuit structure, and semiconductor devices | |
| CN102627823B (en) | Transparent conductive resin, color membrane substrates and making method, liquid crystal indicator | |
| CN108717239B (en) | Easy-to-heat-erase liquid crystal film writing board and preparation method thereof | |
| US20100151228A1 (en) | Reworkable liquid crystal film and manufacturing method thereof | |
| CN111488065A (en) | Cholesteric liquid crystal handwriting board and preparation method thereof | |
| CN103992495A (en) | Nano-silver flexible conductive membrane and preparation method thereof | |
| CN102208547B (en) | Substrate for flexible photoelectronic device and preparation method thereof | |
| CN113372765B (en) | MXene-based electrothermal ink and preparation method and application thereof | |
| WO2014173112A1 (en) | Sealant, sealing method thereof, display panel, and display apparatus sealed using the sealant | |
| WO2019015018A1 (en) | Full-solid state reflecting film and preparation method therefor | |
| JP4635421B2 (en) | Conductive film for transfer and method for forming transparent conductive film using the same | |
| CN109164620B (en) | Full-self-healing stretchable liquid crystal light scattering display device and preparation method thereof | |
| CN101419358A (en) | Polymers dispersed liquid crystal light valve and method for making same | |
| JP4666961B2 (en) | Object provided with transparent conductive layer, and conductive film for transfer | |
| CN101334549A (en) | Intelligent light modulation film manufacturing technique | |
| CN102532773A (en) | Polymer dispersed liquid crystal film and production process thereof | |
| US5474629A (en) | Method for manufacturing a liquid crystal device | |
| KR20050061382A (en) | Transfer functional film, method for forming functional layer and object to which functional layer is applied | |
| CN111574739B (en) | Modified spacer powder, preparation method thereof and liquid crystal handwriting board | |
| US10435302B2 (en) | Manufacturing method of carbon nanotube conductive microspheres and conductive glue |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200804 |
|
| RJ01 | Rejection of invention patent application after publication |